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Ferroic materials (ferromagnetic, ferroelectric, ferroelastic) usually divideinto domains with different orientations of their order parameter. Couplingdifferent ferroic systems creates new functionalities, for instance theelectrical control of macroscopic magnetic properties including magnetizationand coercive field. Here we show that ferroelastic domains can be used tocontrol both magnetic order and magnetization direction at the nanoscale with avoltage. We use element-specific x-ray imaging to map the magnetic domains as afunction of temperature and voltage in epitaxial FeRh on ferroelastic BaTiO3.Exploiting the nanoscale phase-separation of FeRh, we locally interconvertbetween ferromagnetism and antiferromagnetism with a small electric field justabove room temperature. Our results emphasize the importance of nanoscaleferroic domain structure to achieve enhanced coupling in artificialmultiferroics.

Local electrical control of magnetic order and orientation by ferroelastic domain arrangements just above room temperature